title: Pyridine-4-carbaldehyde-fumaric acid (2/1).
abstract: In the title co-crystal, 2C6H5NO·C4H4O4, two crystallographically different hydrogen-bonded trimers are formed, one in which the components occupy general positions, and one generated by an inversion centre. This results in the uncommon situation of Z = 3 for a triclinic crystal. In the formula units, mol-ecules are linked by O-H⋯N hydrogen bonds.
authors.affiliation: Department of Chemistry & Biology, New Mexico Highlands University, 803 University Avenue, Las Vegas, NM 87701, USA.
authors.forename: Bhupinder
authors.initials: B
authors.lastname: Sandhu
authors.forename: Sergiu
authors.initials: S
authors.lastname: Draguta
authors.forename: Marina S
authors.initials: MS
authors.lastname: Fonari
authors.forename: Mikhail
authors.initials: M
authors.lastname: Antipin
authors.forename: Tatiana V
authors.initials: TV
authors.lastname: Timofeeva